地震地质 ›› 2016, Vol. 38 ›› Issue (3): 631-645.DOI: 10.3969/j.issn.0253-4967.2016.03.010

• 研究论文 • 上一篇    下一篇

海南岛及邻区地壳S波Q值成像特征研究

王惠琳1, 徐晓枫1, 周龙泉2, 张晓东3, 沈繁銮1, 李志雄1, 占伟4   

  1. 1 海南省地震局, 海口 570203;
    2 中国地震台网中心, 北京 100045;
    3 中国地震局地震预测研究所, 北京 100036;
    4 中国地震局第一监测中心, 天津 300180
  • 收稿日期:2015-08-06 修回日期:2015-11-21 出版日期:2016-09-20 发布日期:2016-10-15
  • 作者简介:王惠琳,女,1982年生,2011年毕业于中国地震局地震预测研究所固体地球物理专业,获硕士学位,助理研究员,主要从事地震层析成像研究、地震活动性工作,电话:18889827682,E-mail:huilin95@163.com。
  • 基金资助:

    地震科技星火计划项目(XH12037Y)资助

CRUSTAL Qs TOMOGRAPHY IN HAINAN ISLAND AND ADJACENT REGIONS

WANG Hui-lin1, XU Xiao-feng1, ZHOU Long-quan2, ZHANG Xiao-dong3, SHEN Fan-lua1, LI Zhi-xiong1, ZHAN Wei4   

  1. 1 Earthquake Administration of Hainan Province, Haikou 570203, China;
    2 China Earthquake Networks Center, Beijing 100045, China;
    3 Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China;
    4 First Crust Monitoring and Application Center, China Earthquake Administration, Tianjin 300180, China
  • Received:2015-08-06 Revised:2015-11-21 Online:2016-09-20 Published:2016-10-15

摘要:

利用海南岛及邻区2000-2012年精定位后的地震S波资料进行Qs值成像,得到区域Qs值分布和滑动平均Qs值变化,结合地震活动、火山、热流点和GPS基线变化分析区域浅层地壳(深5~15km)S波衰减的时空变化特征,并讨论了区域地壳介质应力条件状态变化的特点。结果表明:1)衰减成像结果显示研究区Qs值空间上横向不均匀变化显著,总体呈现海南岛中部高、周边低的特征,低Qs值(高衰减)主要分布在王五-文教断裂以北、尖峰-吊罗断裂以南及铺前-清澜断裂以东区域。地震活动多丛集分布在高、低Qs值过渡区域,火山主要分布在王五-文教断裂以北的雷琼坳陷低Qs值区域及其附近,大地热流点分布于低Qs值及其边缘区域。2)滑动平均Qs值的时间变化特征与地震活动性、泸州-琼中GPS基线变化存在较强的相关性。2000-2008年,研究区地震活动性较强,泸州-琼中GPS基线呈缩短趋势,滑动平均Qs值相对较高,区域可能处于“高”应力介质条件状态;2008-2012年,研究区地震活动性较弱,泸州-琼中GPS基线显示伸长趋势,滑动平均Qs值相对较低,区域可能处于应力调整、松弛的“低”应力介质条件状态。

关键词: Qs成像, 地震活动性, 火山, 热流, GPS基线, 海南岛及邻区

Abstract:

Using double-difference precise location results of seismic S wave data from 2000 to 2012, distribution and variation of dynamic moving average Qs value are imaged in Hainan Island and adjacent regions through seismic attenuation tomography. We explore regional crustal S-wave attenuation characteristics of temporal and spatial variation combined with seismic activity, volcanoes and heat distribution, and GPS baseline changes. The results show that:(1)Attenuation imaging shows that there is a significant lateral heterogeneity in Qs distribution in the study area and the Qs values are high in the central region and low in the north and south regions of Hainan Island. Low-Qs areas are baseically converged to the north of Wangwu-Wenjiao Fault, to the south of Jianfeng-Diaoluo Fault, and to the east of Puqian-Qinglan Fault. Earthquakes are basically converged to the edge of the transitional regions of high and low Qs values. Heat flow sites and volcanoes zones are located in low-Qs area in the region. (2)There is a strong correlation between dynamic moving average Qs value, seismic activity and Luzhou-Qiongzhong GPS baseline. From 2000 to 2008, the average Qs value of the study area is relatively high, the seismic activity is strong, and Luzhou-Qiongzhong GPS baseline is decreasing. From 2008 to 2012, the average Qs value of the study area shows a downward trend, the seismic activity is weak, and the Luzhou-Qiongzhong GPS baseline displays an elongation trend.

Key words: Qs tomography, seismic activity, volcanoes, heat flow, GPS baseline, Hainan Island and adjacent regions

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